I don't think it's so much a worry about shutting down. Keeping any unit cooled will (should) prolong it's life. Remember when the office "computer" was in a big glassed-in room with a raised egg crate floor and always super a/c'd?

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LIFE ALERT is God's way of saying, "I called, but someone else picked-up."

That's what I did, Rick (TX-SR805). I found an old power supply that had a smallish plug (rather than a wall-wart) and just plugged it into the switched outlet on the back of the receiver. I have two fans running off that supply - one blowing down into one side of the unit and the other blowing across the top (it is in a semi-enclosed rack). Noise is not an issue.

My understanding is that a good part of the heat problem comes from the video processor, not the amplifier. That's why I have the fan blowing down into the right-rear of the unit (yours may have different architecture).

Both Peter and I have "vintage" Onkyo receivers also. I know mine runs warm. I also know it's been running almost non-stop for about 15 years.

I had an Onkyo 502 before this, it didn't run quite a hot as this newer unit does. I figured as you say Tom, it's the processor so I have it pulling the hot air up. The fan is located at the right rear.

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Rick

"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud